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Chuckl 10-18-2008 04:52 PM

Access panel
 
I have a comfortmaker furnace. How do I get the burner area access panel off? It has a small viewing window in what I believe is the panel, but removing the sheet metal screws won't get me there.

hvaclover 10-18-2008 06:28 PM

Quote:

Originally Posted by Chuckl (Post 173692)
I have a comfortmaker furnace. How do I get the burner area access panel off? It has a small viewing window in what I believe is the panel, but removing the sheet metal screws won't get me there.


Why do you want to pull the cover off?

Is this a 90% furnace?

Chuckl 10-19-2008 10:09 AM

Burner won't stay on and I want to check the flame sensor. It re-cycles ok to the point where the burners ignite, then goes out. I think it's a 90

hvaclover 10-19-2008 10:18 AM

0%0
Quote:

Originally Posted by Chuckl (Post 173918)
Burner won't stay on and I want to check the flame sensor. It re-cycles ok to the point where the burners ignite, then goes out. I think it's a 90


OK I can help. I know the brand and still rep it. Tell me how old it is.

Comfortmaker made an 80% and a 90% with an enclosed burner.

The 90 vented out the side wall with PVC pipe. The 80 vented with metal pipe into a chimney.

Now that that's out of the way tell me how it's acting so we can be sure we are going in the right direction.

I know you Say burners won't say on but there are other ting that cause the same symptoms.

Chuckl 10-19-2008 10:33 AM

Thanks for your time....It vents out the top into a chimney...must be an 80?

Don't know how old it is. I've been here 5 years and it wasn't new when we moved in.

It's cooled off here and we tried to get the chill out of the house the other day. We turned the thermostat from cooling to heat, turned it up about 10 degrees and waited. Nothing happened so I checked the furnace for a pilot lite (shows how old I am), but it has an electronic ignitor. There is a blower that comes on in the gas valve area and stays on. I turned the thermostat down, shut off the gas supply and turned off the power to the furnace to recycle it, and waited about 5 min. Turned gas on, thermostat up and power on, and that's when the burner tried to ignite for a few seconds and went back out.

hvaclover 10-19-2008 10:43 AM

Ok, turn furnace off by the light switch on the side.

Set thermostat as high as it goes.

Look into the burner window and turn on power.

The inducer should come on and after a while you should be able to see
a red glow in the burner.

Note if burners light, describe how they look before they go out.

Burners should be mosly blue with very littel yellow or orange.

Chuckl 10-19-2008 12:17 PM

I did what you said. The induction motor came on, and after about 10-20 sec. the ignitor glowed orange followed by the burners coming on. They stayed on this time and had a blue uniform flame and after 10 sec or so the furnace blower came on. Hoping against hope that it may have returned to normal, I let it blow for several minutes and turned the temp down to kick it off. One lunch break later I tried it again . Induction motor on, orange glow on for a sec, then burners on for 4 sec....orange glow off, burners off. It recycled 2 more times with similar results.......HELP

hvaclover 10-19-2008 12:35 PM

I am here to save the day:laughing:

You already have the screws. What;s holding it tight is the rubber gasket.

Grab the right side with the finger tips of both hands and pull out.

Don'T be afraid to coax it with a putty knife or flat head screw. The heat of the burners makes the gasket sticky but it will come off. It's a good fit that makes it a little hard to remove also.

Let me know when you get the cover off.

Chuckl 10-19-2008 12:45 PM

In your opinion, would you be thinking flame sensor?

hvaclover 10-19-2008 12:53 PM

That or a combustion disc.

Clean the sensor first if that does not do it then we dig a little deeper.

BTW, do you have a meter that measures micro amps DC?

Chuckl 10-19-2008 02:19 PM

I got the panel off after some arguing with it, but from where the sensor is located and the igniter is hooked in, I've decided my old bones no longer bend that way, so...........time to call a pro. Thanks for your help.

hvaclover 10-19-2008 02:28 PM

Don't be a wuss! You got it 3/4 licked.

I ain't no spring chicken neither.

Holding that sensor is a phillips head screw. Get you a long snank no2 and un -screw the sensor and clean it with an SOS pad.

Chuckl 10-20-2008 01:11 PM

Thanks again for the help. The *pro* got here this morning and fixed it. The flame sensor was ok, the ignitor checked ok, but...the control module needed replaced. He said that furnace is 20 years old and eventually will shoot craps, but for now I guess I'll keep pushing it. Thanks again.:thumbsup:


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